Questions tagged [torque]

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2answers
130 views

How much suspended weight and how far down would it need to be lowered in order to generate 100 kWh?

I am working on a 100 kWh capacity gravity battery bank. How much suspended weight and how far down would it need to be lowered in order to generate 100 kWh? How many kWh would it take to lift the ...
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2answers
56 views

Measure torque with a BLDC motor

I'm trying to build a bench test in order to measure the torque required to put and keep in rotation a brake which function with friction. The rotational speed for this test is slow (15 RPM) to be ...
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1answer
52 views

How is the feedback estimated in the torque mode control of a servo motor?

The torque mode control of a servo motor requires the feedback of the current torque generated by the motor in order to compare it against the torque reference signal. Is the product \$K_t I\$ of the ...
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0answers
32 views

Is torque constant times the motor current the only way to estimate torque feedback in a servo motor?

Consider a torque and position tracking servo motor. Once the motor reaches the target position (assume no external torque applied), the end effector should apply a torque which tracks the torque ...
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0answers
39 views

Motor RPM different to calculated value [closed]

I have been given a model of an induction motor and asked to plot a speed & torque curve using thevenin equivalent parameters. I have done this and I have triple checked my calculations, they are ...
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2answers
41 views

What happens when the motor torque is constant and the load torque suddenly decreases?

It is a situation where the load torque (Ta) suddenly decreases while rotating the shaft with a motor(PMSM) at a constant motor torque (Tm). In my opinion, the rotational speed of the shaft (I-moment ...
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1answer
53 views

Accurate Static Pulling (with electric motor?)

I am trying to see if I could accurately apply a static pull to a cord to create tension. I should not be measuring the tension directly, only be sure that the pull I apply is the force in Newtons ...
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0answers
46 views

Is it possible to regulate the amount of counter torque in a generator?

I have a question for a machine I am working on, The machine is used to pre-tension steel wire ropes for maritime uses, the wire rope sits on a drum with a 2m diameter. The tension has to be ...
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1answer
50 views

Torque Control of DC fan using Arduino

I am trying to control the torque of a 24V-DC fan (datasheet) using an arduino. A control system with feedback must be setup to continuously check the torque of the motor and correct it, if the value ...
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1answer
45 views

finding the right torque and motors

I am trying to find the right motors for the following case: I want to have a total of two motors on opposite sides of a board. The board will have a maximum weight of 150kg (330 lbs) and needs to ...
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1answer
40 views

Current Driven DC Motor

For a work school project of mine, I am trying to make a self-balancing robot. I am using these Pololu DC motors and my 4s Lithium Ion battery pack outputs 15.7V at a rated 2Ah. Currently I am using ...
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6answers
141 views

Are we controlling the speed or torque when we press the accelerator pedal in an electric car?

In this video, at 16:23, the presenter says that when we press the accelerator pedal in an electric car, we are "commanding torque and not speed". I'm confused here, aren't we making the car ...
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2answers
64 views

Producing a small homemade generator with reduced cogging torque

Background: I'm working on my second hobby small generator design. Particularly difficult to source are (relatively) low speed permanent magnet motors that can be run in reverse as a generator with ...
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3answers
133 views

Is it possible to use an electrical motor with a constant torque while simultaneously turning against it?

I've been thinking about whether it is possible to have an electrical motor output a constant torque against which one can then apply a force without breaking the motor? I guess the best example would ...
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0answers
41 views

How to make a synchronous generator unstable

I was try to analyse what factors can affect the stability of synchronous generator . Let's say a synchronous generator working in isolation and some loads are connected to it and we have to make it ...
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1answer
38 views

Steady State speed of rotor in following doubly excited system

I'm trying to analyse following system - A three phase armature winding on stator and on rotor field winding and both stator and rotor are cylindrical . And armature winding is connected to a three ...
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1answer
38 views

Counter torque in alternator supplying reactive power

When an alternator(assume zero armature resistance and iron loss) is supplying purely lagging/leading current, which means there is no work done by the current supplied, does that mean the counter ...
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1answer
26 views

Servo and power supply problems

I'm new to Arduino so baby language for me please :) Problem: I'm trying to power 2 servos (https://www.amazon.co.uk/gp/product/B07DQFXDC9/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1) but ...
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1answer
41 views

Stepper Motor angle after gear

I wanted to ask a relatively simple question: Currently I am using a 3 phase AC motor that has a Gearbox torque of 5.1 Nm. A 16 teeth gear is attached to the shaft and this is connected to a 72 teeth ...
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0answers
95 views

Universal motor torque measurement

I would like to control AC universal motor (brushed). I would like to know the load torque, but I cannot measure the torque directly. I have to calculate it from motor parameters. Please let me know ...
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3answers
156 views

Why don't *small* electric cars use small cheap hobby motors? [closed]

The automotive blogger Jason Torchinsky recently bought an inexpensive electric car, a Changli Nemeca, whose motor he describes as being powered by five car batteries and producing 1.1 horsepower (820 ...
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1answer
130 views

How to calculate the torque constant for a BLDC motor

I am designing a 12lb hobby robot with a 1000Kv BLDC motor at 14.8V nominal voltage and stall torque of 30A. How do I solve for the torque constant. I have seen equations where Kt(torque constant) = 1/...
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1answer
46 views

Why slip is negative in this plot?

I have the following plot (please see first 2 plots below). The asynchronous motor is working as a generator. I wonder why the slip is going negative, is it because the torque also goes negative? Like ...
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1answer
42 views

How reliable are motor power ratings through time (old motors vs new motors)?

I'm making this question here because I'm a little bit confused with what I've been seeing from some old and new 1/2 hp motors. I've bought a 1/2 hp induction motor (4-pole, single phase, capacitor ...
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1answer
101 views

What is the best way to measure and record the power consumption of a servo motor accurately?

I can obtain the rotational angle and velocity of a servo motor. However, I cannot obtain the current nor torque while the motor is turning. What is the best way to measure the power consumption of a ...
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1answer
44 views

BLDC Motor question

Im looking for a solution, i have a 3kW 320V 3000rpm rated BLDC motor with position hall encoder and a chinese driver. The hall-feedback is working with it. I would like to use motor between 15 and ...
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2answers
180 views

Using a motor as a brake

I want to use the motor of an electric vehicle as a brake. It is a 36V ~27A motor. I looked up 500W+ resistors and they are quite pricey, I figured the cheapest alternative would be 100W resistors in ...
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1answer
291 views

Old Record Player Motor Doesn't Have Torque To Start

I am restoring a jukebox from 1953 (AMI E-120). Everything is going fine except the main drive motor, an A/C induction motor, cannot start under the load of the platter. It starts fine when the ...
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2answers
146 views

Do Induction Motors only work if the rotor's coils have a finite resistance?

I just did some calculations, and to me it seems that the induction motor only works when the rotors coils have finite resistance: I will show that for a single conducting loop, whose current is ...
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2answers
285 views

Relationship between torque and back-EMF voltage | BLDC motor modeling

I want to simulate an BLDC motor, so I am studying corresponding mathematical model. My problem is that I am little bit confused by the torque equation. \$e_a\$, \$e_b\$, \$e_c\$ - Back-EMF voltages (...
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3answers
140 views

How do i know what resistor value, that's attached to a BLDC motor, i should use in order to get a torque of 100 lb-ft put on my actuator?

Motor P/N is M-3441Y-LN-02D. Back EMF [Ke] is 38.95 (Vpeak/Krpm). Continuous torque 2.495 lb-ft. User manual. I want to run the actuator coupled with the BLDC motor 60:1 gear ratio in reverse. So the ...
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3answers
72 views

How can these two motors produce the same torque if their volt/amp ratings are different and their watts/RPM are the same

My rudimentary understanding of a DC brushed motor is speed is proportional to voltage and torque is proportional current. Therefore a 36 volt 500 watt motor should have a higher RPM rating and a ...
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2answers
251 views

Torque and Flux Current

It is said that vector sum of flux and torque current equal to total current drawn by the motor but there are also some currents flowing due to copper losses and rotor leakage inductance. In my ...
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2answers
2k views

How to electrically brake a brushless motor

I'm sorry if this question is too stupid, unfortunately I have a very low experience with BLDC motors. I would like to use 4 x 350W, 24VDC brushless motor hubs for my wheeled robot (they are usually ...
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0answers
18 views

BLDC and Stepper motor torque ration meaning

Ok so after searching on the internet for a pretty long time there are a lot of undefined or roundabout articles about torque for both motors. Hybrid bipolar stepper motor torque. This one is a little ...
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2answers
57 views

How Can I Efficiently Adjust Difficulty on a Pedal Generator without Mechanical Gears?

I'm charging a battery using pedal power, like this: pedals -> brushless generator -> rectifier -> charge controller -> battery I'd like to be able to ...
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1answer
67 views

Rotor Current and Torque Producing Current in Induction Motor

Is rotor current of an Induction motor always same with torque producing current? In torque equation of Induction motor, there is also one factor called rotor power factor. if rotor current and torque ...
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2answers
65 views

Is the calculation of weight to be suspended inorder to produce electricity from an alternator correct or not?

I bought a alternator with the following specs: power: 5 hp rpm: 1800 voltage: 220V The formula for finding the horsepower is: horsepower= (RPM X Torque)/5252 By substituting the value of horsepower ...
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2answers
51 views

Holding torques of a 7W stepper and a 48W stepper

Does anyone know why a 2.5V 2.8A (=7W) stepper has a holding torque of 1Nm whilst a 24V 4A (=48W) stepper has a holding torque of only 2.7Nm: Stepper 1: Stepper 2: The latter draws 7x the power, ...
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4answers
692 views

Electrical Motors and Frequency

I was musing about electric motors after seeing one randomly on TV, and there's something I'm must be remembering incorrectly. It's just a thought experiment, so I'm imagining some theoretical DC ...
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1answer
26 views

DC series machine

What is the different between electrical and mechanical torque? and How to find the mechanical torque if electrical torque is given?
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1answer
50 views

Torque issues with DC motor

I am currently trying to use a DC motor with a lead screw to eventually open an close a window. My window requires around 2 kg's of force to open and the distance that needs to be traveled is 20 ...
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1answer
34 views

how do i calculate stall torque 5.4kg@ 5v 1000mA?

i came to this website https://www.letsbuyrobots.com/en/robot-humanoide-ls-868, and i want to know the servo spec especially the stall torque, and then i found this "2) Torque:5.4kg@5v 1000mA, Power: ...
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1answer
77 views

Calculations for a DC motor

I want to open and close a window using a DC motor and a lead screw. My window is 20 inches long. I know buying recommendations are outside the scope of this forum. I have little to no knowledge ...
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1answer
151 views

Induction motor starting torque and pull out torque

Recently I was doing some work on the induction motor where I found some general theory on starting speed torque curve of the induction motor. Where the theory is the starting torque will be 1.5x of ...
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1answer
31 views

Sanity check for max motor torque

A KDE brushless DC motor has: Kt = 0.0189 N*m/A (Kv = 505 rpm/V) R = 7 mΩ voltage range of about 30-60 VDC Specsheet link Assume the motor is connected to 30 VDC input ideal, sensored, six-step ...
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0answers
38 views

DC Motors Voltage Equation versus Power Equation

I understand the voltage equation and the power equation for DC motors. But somehow I have a problem understanding moving from one to the other. I am not interested in the IR or IdL/Dt so I will ...
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1answer
61 views

How to conceptualize electric loading in a motor

I'm struggling to understand the concept of "electric loading" or "current density" in a real motor. Soong explains how a sheet of conductors in a magnetic field generate force on that sheet which I'...
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1answer
43 views

How does gearing affect power generated by a permanent magnet DC motor?

I am currently working on a project to harvest electrical energy from a rowing machine. I am trying to make use of gearing ratios to adjust the resistance level offered by the system, and the impact ...
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0answers
35 views

Problem calculating winding temperature in a brushed DC motor

I'm building a rig for measuring pull out torque for stepper motors, and am looking at dynamic braking and plugging of a permanent magnet DC motor which will be used to apply a variable braking torque....

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